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Compromise in mRNA processing machinery in senescent human fibroblasts: implications for a novel potential role of

Panagiotis Chandris1, Christina C Giannouli, George Panayotou

  • 1Institute of Molecular Oncology, Vari, Attiki, Greece. handris@fleming.gr

Biogerontology
|January 20, 2010
PubMed

Insights

Ataxia-Telangiectasia and Rad3 related kinase (ATR) plays a key role in genomic stability and DNA damage response. This study reveals ATR

Area of Science:

  • Cellular Biology
  • Genomics
  • Molecular Biology

Background:

  • Ataxia-Telangiectasia and Rad3 related kinase (ATR) is crucial for genomic stability and DNA damage responses.
  • ATR signaling is implicated in regulating alternative splicing of cancer-associated transcripts.
  • Dysregulation of mRNA synthesis and processing is linked to degenerative diseases like cancer and progeria.

Purpose of the Study:

  • To investigate the role of ATR in RNA processing machinery within senescent fibroblasts.
  • To examine the distribution and localization of active, phosphorylated ATR (pATR) at ser428 in senescent cells.
  • To understand how ATR spatiotemporal presence influences mRNA splicing and polyadenylation.

Main Methods:

  • Comparative analysis of RNA processing in senescent versus young (proliferating or quiescent) fibroblasts.
  • Immunofluorescence to detect the localization of phosphorylated ATR (pATR) at ser428.
  • Assessment of mRNA splicing and polyadenylation patterns in senescent cells.

Main Results:

  • Senescent fibroblasts exhibit altered RNA processing machinery compared to young cells.
  • Distinct patterns of pATR localization were observed in the senescent nucleus.
  • The spatiotemporal presence of pATR is implicated in regulating mRNA splicing and polyadenylation.

Conclusions:

  • ATR plays a significant role in regulating mRNA splicing and polyadenylation.
  • This ATR-mediated function is perturbed in senescent cells.
  • Altered pATR distribution in senescent nuclei suggests a role in cellular aging and disease pathogenesis.

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